fix: update log message for server startup and improve request handling in ServeHTTP

cmd/root.go

@@ -66,7 +66,7 @@ var rootCmd = &cobra.Command{
 		)
 
 		logger.Logger.Info().
-			Msg("starting SteamCache2 on port 80")
+			Msg("SteamCache2 listening on port 80")
 
 		sc.Run()
 

steamcache/steamcache.go

@@ -179,6 +179,8 @@ func (sc *SteamCache) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if strings.HasPrefix(r.URL.String(), "/depot/") {
+
 		tstart := time.Now()
 
 		cacheKey := strings.ReplaceAll(r.URL.String()[1:], "\\", "/") // replace all backslashes with forward slashes shouldn't be necessary but just in case
@@ -306,4 +308,22 @@ func (sc *SteamCache) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			Int64("size", int64(len(body))).
 			Dur("duration", time.Since(tstart)).
 			Msg("request")
+		return
+	}
+
+	if r.URL.Path == "/favicon.ico" {
+		w.WriteHeader(http.StatusNoContent)
+		return
+	}
+
+	if r.URL.Path == "/robots.txt" {
+		w.Header().Set("Content-Type", "text/plain")
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("User-agent: *\nDisallow: /\n"))
+		return
+	}
+
+	requestsTotal.WithLabelValues(r.Method, "404").Inc()
+	logger.Logger.Warn().Str("url", r.URL.String()).Msg("Not found")
+	http.Error(w, "Not found", http.StatusNotFound)
 }